using System;

​

public class Program

{

    public static void Main()

    {

        Start:

            double userInput;

        Console.Write("Enter how many square roots you want to calculate: ");

        string input = Console.ReadLine();

        if (double.TryParse(input, out userInput))

        {

            if (userInput >= 0)

            {

                double number = 1;

                do

                {

                    Console.WriteLine("The square root of " + number + "=" + Math.Sqrt(number).ToString("##.###" ));

                    number++;

                }

                while(number <=userInput);

            }

                else

                {

                    Console.WriteLine("Please enter a positive number.");

                }

            }

            else

            {

                Console.WriteLine("Invalid input. Please enter a valid number.");

            }

        Console.WriteLine("Would you like to calculate more square roots? y/n");

        string yn = Console.ReadLine();

        if (yn == "y" || yn == "Y")

        {

            Console.Clear();

            goto Start;

        }

        }

    }